Mesoporous solid strong alkali catalyst as well as preparation method and application thereof
A solid base catalyst, base catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of not generating strong base sites, destroying mesoporous structure, etc., achieving low operating costs, catalytic ideal effect
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Embodiment 1
[0025] Weigh 0.81g ZrO(NO 3 ) 2 Dissolve in 10 mL of deionized water, add 1 g of SBA-15 under stirring, stir at room temperature for 24 h, and then evaporate to dryness in a water bath at 80 °C. Then the sample (0.5g) of the loaded precursor is placed in an open container, and the container is placed in a polytetrafluoroethylene autoclave with a volume of 50mL containing 28% ammonia, and the ammonia solution and the solid are not in contact. Put the sealed autoclave in an oven at 60°C for 0.5h. The treated sample was placed at room temperature for 6h, dried at 100°C for 12h, and the obtained white powder was placed in a tube furnace and calcined at 500°C for 5h in air, so that ZrO(NO 3 ) 2 converted to ZrO 2 Plating finish, the resulting sample is marked ZS.
[0026] Weigh 0.25g of KNO 3 Dissolve in deionized water, add 0.75g carrier ZS under stirring state, stir at room temperature for 24h, evaporate to dryness in 80°C water bath, then dry in 100°C oven for 4h, place th...
Embodiment 2
[0029] Weigh 0.25g of LiNO 3 Dissolve in deionized water, add 0.75g carrier ZS under stirring state, stir at room temperature for 24h, evaporate to dryness in 80°C water bath, then dry in 100°C oven for 4h, place the obtained sample in a tube furnace The LiNO 3 break down. The alkali content of this solid base catalyst is 3.6mmol·g -1 .
[0030] Add 16g of methanol, 8.7g of ethylene carbonate and 0.08g of catalyst into the flask, and stir at 65°C for 4 hours under normal pressure. The supernatant is obtained by centrifugation and analyzed by gas chromatography. The yield of DMC is 39.3%.
Embodiment 3
[0032] Weigh 0.25g of NaNO 3 Dissolve in deionized water, add 0.75g carrier ZS under stirring state, stir at room temperature for 24h, evaporate to dryness in 80°C water bath, then dry in 100°C oven for 4h, place the obtained sample in a tube furnace The NaNO 3 break down. The alkali content of this solid base catalyst is 2.9mmol g -1 .
[0033] Add 16g of methanol, 8.7g of ethylene carbonate and 0.08g of catalyst into the flask, and stir at 65°C for 4h under normal pressure. The supernatant was obtained by centrifugation and analyzed by gas chromatography. The yield of DMC was 33%.
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